JPH04167809A - At-cut thickness shear crystal resonator - Google Patents
At-cut thickness shear crystal resonatorInfo
- Publication number
- JPH04167809A JPH04167809A JP29511190A JP29511190A JPH04167809A JP H04167809 A JPH04167809 A JP H04167809A JP 29511190 A JP29511190 A JP 29511190A JP 29511190 A JP29511190 A JP 29511190A JP H04167809 A JPH04167809 A JP H04167809A
- Authority
- JP
- Japan
- Prior art keywords
- crystal
- overtone
- crystal chip
- axis
- width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 50
- 230000010355 oscillation Effects 0.000 abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 239000011034 rock crystal Substances 0.000 abstract 1
- 230000005284 excitation Effects 0.000 description 12
- 238000005452 bending Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、オーバート−ンの発振を容易に行えるへ′Ｆ
カットの厚みずへり水晶振動子に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical field of the invention)
Concerning cut thickness edge crystal oscillators.
（発明の技術的背景とその問題点）
一般に水晶振動子の１騒動モートには、屈曲撮動、たわ
み振動、厚み振動等種々の振動モートがある。(Technical background of the invention and its problems) In general, there are various types of vibration motes of a crystal resonator, such as bending vibration, deflection vibration, and thickness vibration.
そし゛Ｃ１共振周波数がＭＨ２ないし十数ＭＨｚの水晶
振動子では主に厚みずへり振動モートを使用している。In a crystal resonator with a C1 resonance frequency of MH2 to 10-odd MHz, a thickness-edge vibration mode is mainly used.
この厚みすべり振動モードで励振する水晶振動子の共振
周波数は水晶片の厚みに逆比例し、たとえば共振周波数
が１０ＭＨｚの水晶片の厚みは約０．１６７ｍｔｎ、共
振周波数が３０ Ｍ Ｈ２の水晶片の厚みは約０ 、
０５６１’ｔｌ ｍになる。したがりて、共振周波数が
高くなると厚みは著しく薄くなり水晶片の強度、加工上
の問題から製作は極めて困難になる。The resonant frequency of a crystal resonator excited in this thickness-shear vibration mode is inversely proportional to the thickness of the crystal piece.For example, the thickness of a crystal piece with a resonant frequency of 10 MHz is approximately 0.167 mtn, and the thickness of a crystal piece with a resonant frequency of 30 MH2 is inversely proportional to the thickness of the crystal piece. The thickness is approximately 0,
It becomes 0561'tl m. Therefore, as the resonant frequency increases, the thickness becomes significantly thinner, and manufacturing becomes extremely difficult due to the strength of the crystal piece and processing problems.
このために高い周波数の水晶振動子を必要とする場合は
オーバートーンのモードを使用することが行われている
。オーバート−ンのモードでは、略基本波の共振周波数
の奇数倍の周波数で共振し、一般に３次、５次、７次等
のモードが使用され、次数は発振回路の定数、たとえは
出力側の同調回路の定数によって決定される。For this reason, when a high frequency crystal oscillator is required, an overtone mode is used. In the overtone mode, resonance occurs at a frequency that is an odd multiple of the resonant frequency of the fundamental wave, and 3rd, 5th, 7th, etc. modes are generally used, and the order is determined by the constant of the oscillation circuit, for example on the output side. is determined by the constant of the tuned circuit.
ところで近年、発振回路を小形化し、無調整化するため
に、たとえは水晶振動子と集積回路な一体化して無調整
発振回路を構成した超小型発振器が大量に製造され、使
用されている。しかして、このような構成の発振回路で
は同調回路を有しないためにオーバートーンのモードを
利用することはできないので発振出力の最高周波数は水
晶片の加工上の限界から、たとえば３０ＭＨｚ程度に制
限されることになる。In recent years, in order to downsize oscillation circuits and eliminate the need for adjustment, micro-sized oscillators have been manufactured and used in large quantities, for example, by integrating a crystal resonator and an integrated circuit to form a non-adjustment oscillation circuit. However, since an oscillation circuit with such a configuration does not have a tuning circuit, it is not possible to use the overtone mode, so the maximum frequency of the oscillation output is limited to, for example, about 30 MHz due to limitations in the processing of the crystal piece. That will happen.
（発明の目的）
本発明は、１−記の事情に鑑みてなされたもので、基本
波よりもオーバートーンの等価抵抗が低く無調整発振回
路を用いてオーバートーンの周波数で発振することがで
きるＡＴカット０）１９みずへり水晶振動子を提供する
ことを目的とするものである。(Object of the Invention) The present invention has been made in view of the circumstances described in 1- above, and the equivalent resistance of the overtone is lower than that of the fundamental wave, and it is possible to oscillate at the frequency of the overtone using an unadjusted oscillation circuit. The purpose is to provide an AT cut 0)19 water crystal resonator.
（発明の概要）
本発明は、結晶のＸ軸を幅方向としＺ゛軸を長さ方向と
するＺ゛軸方向に細長い短冊型のＡＴカットの水晶片に
電極を形成した厚み滑り水晶振動子において、上記水晶
片の表裏板面に形成する電極の幅寸法を水晶片の幅寸法
の０．６５倍よりも大きくし、かつ主面の面取りを行わ
ないことを特徴とするものである。(Summary of the Invention) The present invention provides a thickness-slide crystal resonator in which electrodes are formed on a strip-shaped AT-cut crystal piece elongated in the Z-axis direction, with the X-axis of the crystal being the width direction and the Z-axis being the length direction. In this method, the width of the electrodes formed on the front and back surfaces of the crystal blank is larger than 0.65 times the width of the crystal blank, and the main surface is not chamfered.
（実施例）
以下、本発明の一実施例を第１図に示す１ヴみ方向の寸
法を誇張した水晶片の斜視図を参照して詳細に説明する
。(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to a perspective view of a crystal piece shown in FIG. 1 with exaggerated dimensions in the vertical direction.
図中、１１は水晶の結晶をその結晶軸に対して所定角度
に切断してＸ軸を幅方向とし、Ｚ′軸方向に細長く成形
したＡＴカットの厚みすべり水晶片である。そしてこの
水晶片１１の表裏板面の中央部に相対面して励振電極１
２を形成している。In the figure, reference numeral 11 denotes an AT-cut thickness-sliding crystal piece made by cutting a quartz crystal at a predetermined angle with respect to its crystal axis, making the X-axis the width direction, and forming it into an elongated piece in the Z'-axis direction. The excitation electrode 1 faces oppositely to the center of the front and back surfaces of the crystal blank 11.
2 is formed.
そして各励振電極１２から互いに逆方向に水晶片１１の
長手方向の端部へ引き出し電極１３を導出している。そ
して、この導出端に保持電極１４を形成してここを図示
しない保持部材で保持するとともに、この保持部材を介
して上記励振電極１２と外部の回路との電気的な接続を
行うようにしている。Extracting electrodes 13 are led out from each excitation electrode 12 to the ends of the crystal piece 11 in the longitudinal direction in mutually opposite directions. A holding electrode 14 is formed at this lead-out end and is held by a holding member (not shown), and electrical connection is made between the excitation electrode 12 and an external circuit via this holding member. .
なおここで、上記励振電極１２の幅方向の寸法Ｂを水晶
片１１の幅方向の寸法Ａの０．６５倍よりも大きくし、
その上限を１．０倍とするようにしている。Here, the dimension B in the width direction of the excitation electrode 12 is made larger than 0.65 times the dimension A in the width direction of the crystal piece 11,
The upper limit is set to 1.0 times.
そして基本波振動を阻害し、それによって相対的にオー
バートーンの振動を容易にするために、水晶片１１の主
面の面取りを行わないようにしている。 ・
なお水晶片１１の幅方向の寸法Ａに対して励振電極１２
の幅方向の寸法Ｂを上述のごとく定めた理由は次の通り
である。In order to inhibit the fundamental wave vibration and thereby make overtone vibration relatively easy, the main surface of the crystal blank 11 is not chamfered.・For the dimension A in the width direction of the crystal piece 11, the excitation electrode 12
The reason for determining the dimension B in the width direction as described above is as follows.
すなわち、サンプルの水晶振動子として、たとえばＺ軸
を長手方向として５．０間、Ｘ軸を幅方向として１．５
ｍｍの寸法で３次オーバートーンで共振周波数７１ＭＨ
ｚのものを用意した。そして、この水晶片の励振電極の
幅Ｂの寸法を変えたときの等価抵抗（以下ＣＩと称す）
の変化は第２図に示すグラフのようになった。なお第２
図において曲線Ｆは基本波のＣＩの変化、曲線Ｇは３次
のオーバート−ンのＣＩの変化を示している。そして横
軸は水晶片の幅Ａに対する励振電極の幅Ｂの比１３／Ａ
、縦軸はＣＩの値である。That is, as a sample crystal oscillator, for example, the Z axis is 5.0 mm in the longitudinal direction, and the X axis is 1.5 mm in the width direction.
Resonant frequency 71MH with 3rd overtone in dimensions of mm
I prepared something for z. The equivalent resistance (hereinafter referred to as CI) when the width B of the excitation electrode of this crystal blank is changed
The changes were as shown in the graph shown in Figure 2. Furthermore, the second
In the figure, curve F shows the change in CI of the fundamental wave, and curve G shows the change in CI of the third-order overtone. The horizontal axis is the ratio of the width B of the excitation electrode to the width A of the crystal piece, 13/A.
, the vertical axis is the CI value.
この結果から明らかなように３次のオーバートーンのＣ
Ｉは励振電極の幅に関係なく略一定値である。これに対
して基本波のＣＩは励振電極の幅の増大（こつれて大き
くなる。As is clear from this result, the third-order overtone C
I is a substantially constant value regardless of the width of the excitation electrode. On the other hand, the CI of the fundamental wave increases as the width of the excitation electrode increases.
すなわち基本波の共振による変位は板面の全域に広く生
しｌるのに対してオーバート−ンのそれは板面の中央部
分に遍在する。したがって励振電極の幅寸法を大きくす
ると質量の付加効果によって基本波の共振は阻害されて
ＣＩは増大し、相対的にオーバートーンの共振に対する
ＣＩは向−にする。That is, the displacement due to resonance of the fundamental wave occurs widely over the entire surface of the plate, whereas that of the overtone is omnipresent in the central portion of the plate surface. Therefore, when the width of the excitation electrode is increased, the resonance of the fundamental wave is inhibited by the added effect of the mass, and the CI increases, and the CI for the overtone resonance is relatively directed.
また水晶片の主面の面取りを行わないと基本波の共振は
充分なエネルギー閉じこめ効果を得られないためにＣＩ
は増大する。これに対して、オーバートーンの共振は板
面の中央部分に遍在するために主面の面取りを行わない
ことによる影響をほとんど受けないので相対的にＣＩは
低くなる。In addition, unless the main surface of the crystal piece is chamfered, the resonance of the fundamental wave will not have a sufficient energy confinement effect, so CI
increases. On the other hand, since the overtone resonance is omnipresent in the central portion of the plate surface, it is hardly affected by not chamfering the main surface, so the CI becomes relatively low.
しかして上述の構成によれば基本波のＣＩよりもオーバ
ートーンのそれを低くてきるので、たとえばコイルを用
いない無調整発振回路を用い°Ｃオーバートーンの周波
数で安定に発振させることかでき発振器の小型化、無調
整化を図ることができる。However, according to the above configuration, since the CI of the overtone is lower than the CI of the fundamental wave, it is possible to stably oscillate at the frequency of the °C overtone using, for example, an unadjusted oscillation circuit that does not use a coil. It is possible to reduce the size and eliminate the need for adjustment.
（発明の効果）
以］二詳述したように本発明によれは、たとえは−６＝
無、ａ整発振回路を用いてオーバート−ンの発振を行う
ことができ、形状か小塑で無調整で高い同波数の発振出
力を得ることかできるＡ′ｖカットの厚みすへり水晶振
動子を提供することができる。(Effects of the Invention) As described in detail below, according to the present invention, it is possible to perform overtone oscillation using an oscillation circuit with -6 = none, a-balanced oscillation circuit, and even if the shape is small or small. It is possible to provide an A'v-cut, thin-thickness crystal resonator that can obtain oscillation output of the same high wave number without adjustment.
第１図は本発明の一実施例の水晶振動子を示す斜視図、
第２図はザンブルの水晶振動子の電極幅と水晶）１の幅
の比を横軸に、これ（。二対する基本波および；３次の
オーバート−ンの等価抵抗値を縦軸で示すグラフである
。
１１・・・・・水晶片
１２・・・・・励振電極
１３・・・・・引き出し電極
１４・・・・・保持電極
Ａ ・・・・・水晶片の輻
Ｉ３ ・・・・・励振電極の幅
占
ｏ幸FIG. 1 is a perspective view showing a crystal resonator according to an embodiment of the present invention. FIG. It is a graph showing the equivalent resistance values of waves and third-order overtones on the vertical axis. 11...Crystal blank 12...Excitation electrode 13...Extraction electrode 14...・・・Holding electrode A ・・・・Radius I3 of crystal piece ・・・Width measurement of excitation electrode
Claims (1)
方向に細長い短冊型のＡＴカットの水晶片に電極を形成
した厚み滑り水晶振動子において、上記水晶片の表裏板
面に形成する電極の幅寸法を水晶片の幅寸法の０．６５
倍よりも大きくし、かつ主面の面取りを行わないことを
特徴とする短冊状のＡＴカットの厚みすべり水晶振動子
。In a thickness-slide crystal resonator in which electrodes are formed on a strip-shaped AT-cut crystal piece elongated in the Z'-axis direction, with the X-axis of the crystal being the width direction and the Z'-axis being the length direction, the front and back plate surfaces of the crystal piece are The width of the electrode to be formed is 0.65 of the width of the crystal piece.
A strip-shaped AT-cut thickness-slide crystal resonator characterized by being larger than twice as large and having no chamfering on its main surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29511190A JPH04167809A (en) | 1990-10-31 | 1990-10-31 | At-cut thickness shear crystal resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29511190A JPH04167809A (en) | 1990-10-31 | 1990-10-31 | At-cut thickness shear crystal resonator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04167809A true JPH04167809A (en) | 1992-06-15 |
Family
ID=17816438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29511190A Pending JPH04167809A (en) | 1990-10-31 | 1990-10-31 | At-cut thickness shear crystal resonator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04167809A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007174630A (en) * | 2005-11-28 | 2007-07-05 | Daishinku Corp | Crystal oscillator |
-
1990
- 1990-10-31 JP JP29511190A patent/JPH04167809A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007174630A (en) * | 2005-11-28 | 2007-07-05 | Daishinku Corp | Crystal oscillator |
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